angular diameter

angular diameter

noun Astronomy.
the angle that the apparent diameter of a celestial object subtends at the eye of the observer.

Origin:
1870–75
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Angular diameter is always a great word to know.
So is light-year. Does it mean:
the distance traversed by light in one mean solar year, about 5.88 trillion mi. (9.46 trillion km)
the movement or path of the earth or a heavenly body turning on its axis
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